{"id":"F2006B10049","name":"AD/G1159/6 - Vertical Tail Rear Beam Attaching Bolts - Inspection and Modification","slug":"ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55485,"registerId":"commonwealth-F2006B10049-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G1159/6 - Vertical Tail Rear Beam Attaching Bolts - Inspection and Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes\n\n \n\nAD/G1159/6  Vertical Tail Rear Beam Attaching Bolts - Inspection and Modification\n\n\n11/72\n\n \n\nApplicability: All models.\n\n \n\nDocument: Grumman Gulfstream II Aircraft Service Change No. 139.\n\n \n\nCompliance: Within 100 hours time in service or 3 months after 30 November 1972 whichever occurs first.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1546},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: remedying a specific airworthiness deficiency concerning vertical tail rear beam attaching bolts on Gulfstream II aircraft. There is no evidence of scope creep or expansion into unrelated maintenance areas."},"complexity_factors":["Single, discrete compliance action with no subsections or parts","No defined terms or interpretation sections","Minimal conditional logic limited to the 'whichever occurs first' deadline calculation","No cross-references to other legislative provisions beyond the enabling Civil Aviation Regulations Part 39","Technical requirement incorporates external document by reference (Service Change No. 139) rather than spelling out detailed engineering specifications"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of Gulfstream (Grumman) G‑1159 (Gulfstream II) and G‑IV series aircraft to inspect and modify the bolts attaching the vertical tail rear beam to the fuselage to ensure secure tail attachment. Compliance must follow Grumman Gulfstream II Aircraft Service Change No. 139 and be completed within 100 flight hours or three months after 30 November 1972."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification","history":"/api/acts/ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification/history","analysis":"/api/acts/ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification/analysis","conflicts":"/api/acts/ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification/important-cases","documents":"/api/acts/ad-g1159-6-vertical-tail-rear-beam-attaching-bolts-inspection-and-modification/documents"}}